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$150+ Cheap flights from Ontario to Knoxville (ONT - TYS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — TYS
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheapflights Tip: The best prices from Ontario to Knoxville McGhee Tyson are usually found in November or January, booked 47 days in advance, depart on a Saturday or Tuesday and return on a Tuesday

Cheap flight deals from Ontario to Knoxville

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Knoxville (TYS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 3, 2025.

Round-trip from

$236
(Frontier)

One-way from

$150
(Frontier)

Popular in

June

Cheapest in

November

Average price

$428
From Ontario to Knoxville McGhee Tyson
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One-way flight from Ontario to Knoxville McGhee Tyson
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Highest demand for flights based on searches. 14% potential increase in price ($67 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Ontario to Knoxville

Cheapest flights from Ontario to Knoxville
Explore the most affordable flight options available from Ontario to Knoxville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

This Frontier deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2012:59 amONT - TYS
1 stop15h 42mFrontier
Thu 8/288:36 pmTYS - ONT
1 stop6h 14mFrontier
Deal found 6/30$236
This Trip.com deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/3012:59 amONT - TYS
1 stop18h 28mMultiple Airlines
Sun 8/33:54 pmTYS - ONT
1 stop10h 56mMultiple Airlines
Deal found 7/1$272
This Delta deal was found by Cheapflights users on 6/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/410:05 pmONT - TYS
1 stop8h 45mDelta
Mon 8/116:14 pmTYS - ONT
1 stop7h 06mDelta
Deal found 6/30$289
This American Airlines deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/212:31 pmONT - TYS
1 stop6h 22mAmerican Airlines
Sun 8/246:39 pmTYS - ONT
1 stop8h 29mAmerican Airlines
Deal found 7/3$290
This United Airlines deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/56:00 amONT - TYS
1 stop9h 11mUnited Airlines
Tue 8/199:30 amTYS - ONT
2 stops14h 13mUnited Airlines
Deal found 7/2$384

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Knoxville that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 3, 2025.
Use the filters below to find and compare flights from Ontario to Knoxville that are best for you.

Fly from

Ontario

Fly to

Knoxville

Route

Depart

Return

Price

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 8/20

12:59 am-7:41 pm

1 stop15h 42m

Knoxville McGhee Tyson

Thu 8/28

8:36 pm-11:50 pm

1 stop6h 14m

$236

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 7/30

12:59 am-10:27 pm

1 stop18h 28m

Knoxville McGhee Tyson

Sun 8/3

3:54 pm-11:50 pm

1 stop10h 56m

$272

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Mon 8/4

11:40 am-11:59 pm

1 stop9h 19m

Knoxville McGhee Tyson

Sat 8/9

5:30 am-10:30 am

1 stop8h 00m

$289

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Thu 8/21

2:31 pm-11:53 pm

1 stop6h 22m

Knoxville McGhee Tyson

Sun 8/24

6:39 pm-12:08 am

1 stop8h 29m

$290

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Tue 8/5

6:00 am-6:11 pm

1 stop9h 11m

Knoxville McGhee Tyson

Tue 8/19

9:30 am-8:43 pm

2 stops14h 13m

$384

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 11/5

12:59 am-4:14 pm

1 stop12h 15m

$150

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Tue 8/5

11:40 am-11:59 pm

1 stop9h 19m

$160

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Mon 11/10

5:40 am-3:51 pm

1 stop7h 11m

$220

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Sun 8/10

6:17 am-5:49 pm

2 stops8h 32m

$348

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Wed 9/17

6:00 am-9:00 pm

2 stops12h 00m

$384

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Best time to book a flight from Ontario to Knoxville

Have a flexible travel schedule? Discover the best time to fly to Knoxville from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Knoxville

How far ahead should I book a flight from Ontario to Knoxville?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Knoxville. Price data was last updated on June 27, 2025.

To ensure you get the cheapest price possible for a flight from Ontario to Knoxville, you should look to book at least 47 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Ontario to Knoxville?

Currently, January is the cheapest month in which you can book a flight from Ontario to Knoxville (average of $296). Flying from Ontario to Knoxville in March is currently the most expensive (average of $376). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to TYS?

Find hourly flight availability from Ontario to Knoxville. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 3, 2025.

It’s typically best to fly out from Ontario to Knoxville in the afternoon. Doing so could potentially save you 14% on the flight price compared to flying in the evening, which is usually more expensive.

Reviews of airlines servicing Knoxville

Get insights into the airlines that provide service to Knoxville. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Knoxville. Reviews last updated July 3, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta, and United Airlines from Ontario to Knoxville. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,982 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Frontier
5.9
Fair
3,286 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Entertainment

7.1

Boarding

8.1

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Knoxville. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Ontario to Knoxville round-trip?

    Currently priced at $236, Frontier will fly you from Ontario to Knoxville and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and American Airlines - these airlines can fly you to your destination from $289 and $290, respectively. These flights start at 39% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Ontario to Knoxville one-way?

    The cheapest airlines for a one-way flight from Ontario to Knoxville are Frontier ($150), Delta ($160), and United Airlines ($220).

  • Can I find deals for flights from Ontario to Knoxville that include hotel bookings?

    Yes. In addition to deals on Ontario to Knoxville flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Knoxville?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Knoxville.

  • Can I find deals for business class flights from Ontario to Knoxville?

    Yes. Cheapflights offers flight deals from Ontario to Knoxville by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Knoxville?

    Currently, January is the cheapest month in which you can book a flight from Ontario to Knoxville (average of $296). Flying from Ontario to Knoxville in March is currently the most expensive (average of $376). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Ontario?

Book flights to Ontario if you plan to visit one of these locations
Morristown
Cherokee
Corbin
Alcoa
Oak Ridge
Murphy

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Top 4 airlines flying from Ontario to Knoxville

Discover the top 4 airlines that operate flights from Ontario to Knoxville. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$123Average$184FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$272Average$407FlexibilityNo cancel feeOn-time71%
DeltaCheapest$288Average$377FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$288Average$443FlexibilityNo cancel feeOn-time69%

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